WO2006022123A1 - 有機el表示装置 - Google Patents
有機el表示装置 Download PDFInfo
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- WO2006022123A1 WO2006022123A1 PCT/JP2005/014127 JP2005014127W WO2006022123A1 WO 2006022123 A1 WO2006022123 A1 WO 2006022123A1 JP 2005014127 W JP2005014127 W JP 2005014127W WO 2006022123 A1 WO2006022123 A1 WO 2006022123A1
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8723—Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8428—Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
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- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
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- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
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- H10K59/875—Arrangements for extracting light from the devices
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- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
Definitions
- the present invention relates to an organic electoluminescence (EL) display device, and more particularly to an organic EL display device including a color conversion layer.
- EL organic electroluminescence
- EL display devices such as a liquid crystal display device (LCD)
- LCD liquid crystal display device
- EL display devices have high visibility due to self-emission, and also have excellent impact properties because they are completely solid.
- a voltage is applied between two electrodes provided with a light emitting layer containing an organic compound, an inorganic compound, or the like interposed between them to cause a current to flow, thereby causing the light emitting layer to emit light.
- One of the full color methods for EL display devices is a method in which EL light incident from the light emitting layer is absorbed by the fluorescent material layer to emit fluorescence (color conversion method: CCM method). Thereby, for example, blue EL light can be converted into green or red fluorescence.
- This EL display device has a color conversion in which a plurality of light shielding layers and a plurality of different color conversion layers including one or more fluorescent material layers are alternately and repeatedly separated in a plane on a translucent support substrate.
- a member (color conversion substrate) and a plurality of light emitting members (EL substrates) arranged in a plane in a position corresponding to the color conversion layer receive light from each light emitting member by the color conversion layer and emit different light. It is arranged so that it does.
- the fluorescent material layer (color conversion layer) needs to absorb EL light sufficiently and emit fluorescence with high efficiency.
- the thickness of the fluorescent material layer is required to be about 10 times or more the color filter thickness (1-2 / ⁇ ⁇ ) used for liquid crystals. The reason is that it is necessary to increase the concentration of the fluorescent material in order to absorb the EL light sufficiently. This is because it is necessary to increase the absorption efficiency without reducing the fluorescence efficiency.
- Patent Document 2 the partition walls are arranged around the display area of the display device.
- the central portion of the display is deflected, which causes a problem in the impact resistance of the organic EL display device and the light emission uniformity on the display surface.
- Patent Documents 3 and 4 a light-shielding layer (a light-blocking layer (spacer) or a light-shielding layer between the organic EL substrate with a support layer (spacer) or a stress relaxation layer facing each other) There is a black matrix), and a column is placed on this shading layer.
- This configuration has the same problems as (1) and requires a thick light-shielding layer and struts or stress relaxation layers separately, which complicates the configuration and increases costs.
- Patent Document 5 a columnar body is formed on a color conversion substrate. However, an overcoat layer for filling gaps between the color conversion layers is necessary, and the columnar body is an organic EL light emitting region. If applied, pressure is applied to the organic light-emitting medium, which may cause display defects due to destruction of the organic light-emitting medium due to generation of stress due to temperature change or the like.
- Patent Document 6 a color conversion substrate in which a color conversion layer is separated by a transparent partition is formed, and the organic EL is directly laminated on the color conversion substrate.
- the partition wall does not function as a spacer for both.
- organic EL is directly affected by the surface smoothness of the color conversion substrate and volatile components such as moisture, and display defects such as disconnection, short circuit, and dark spot are likely to occur.
- Patent Document 1 W098 / 34437
- Patent Document 2 JP 2004-103534 A
- Patent Document 3 Japanese Patent Laid-Open No. 2003-243154
- Patent Document 4 Japanese Unexamined Patent Publication No. 2003-282259
- Patent Document 5 Japanese Patent Laid-Open No. 2003-257658
- Patent Document 6 Japanese Patent Laid-Open No. 2003-229260
- An object of the present invention is to obtain a large-screen, high-definition organic EL display device having an impact resistance with a simple configuration and few display defects.
- the organic EL element and the color conversion layer are arranged to face each other,
- the wall is a partition that separates the color conversion layer, and is a spacer of the organic EL substrate and the color conversion substrate,
- An organic EL display device having a sealing medium together with the color conversion layer between the walls.
- “transparency” of a transparent wall means that the light transmittance in the visible region having a wavelength of 400 nm to 700 nm exceeds 10%.
- the light transmittance at 400 to 450 nm exceeds 10%.
- the preferred aspect ratio (height Z width) of the wall is 1/2 (0.5) to: LOZl (10), and the width is 1 / z ⁇ to 50 / ⁇ ⁇ .
- a more preferable aspect ratio is 2/3 (0.67) to 5Zl (5), and a width is 5 ⁇ m to 30 ⁇ m.
- the light shielding layer corresponding to the wall of the present invention described in Patent Document 1 and the like includes a light shielding material in the photosensitive resin.
- the light-shielding material usually has absorption in the photosensitive region (usually 300 to 450 nm) of the photosensitive resin and cannot be sufficiently exposed in the exposure process of the photolithography process, so it is difficult to increase the thickness and definition. .
- the light shielding layer is formed of a thick metal material, it is difficult to accurately etch the thick metal layer.
- a thick film and high definition can be achieved by forming the wall with a transparent material.
- a high-definition partition can be obtained by arranging a transparent partition between the color conversion layers.
- the color conversion layer can also have high definition, and the aperture ratio of the organic EL display device can be increased to improve the light emission efficiency.
- the barrier ribs can be made thicker, if a phosphor layer is used for the color conversion layer, the phosphor layer can also be made thicker, which improves the fluorescence conversion efficiency of the phosphor, and consequently the organic EL display device. The luminous efficiency is improved.
- the transparent wall also serves as a spacer for the organic EL substrate and the color conversion substrate, the organic EL substrate and the color conversion substrate can be stably (gap controlled) via this spacer. ), Facing and bonding, and, as a result, the impact resistance (mechanical and thermal) stability of the large-screen organic EL display device can be improved.
- organic EL is not directly affected by the surface smoothness of the color conversion substrate and the volatile components such as moisture, defects in the organic EL display device can be reduced.
- the transparent partition wall serves as the separation of the color conversion layer and the spacer, the configuration of the organic EL display device can be simplified and a low-cost organic EL display device can be obtained.
- the light shielding layer By forming the light shielding layer, it is possible to improve the contrast of the organic EL display device and reduce the viewing angle dependency in the case of organic multicolorization and full color.
- the light shielding layer is formed of a thin film that does not hinder high definition and high aperture ratio, and does not have a separation function of the color conversion layer.
- the light emitted from the color conversion layer is reflected by the side of the wall and is effectively used for the display of the organic EL display device.
- a reflective layer is arranged on the side of the wall, or the partition wall scatters and reflects visible light. To do.
- the width of the transparent wall gradually or stepwise from the first substrate (the substrate on which the organic EL is formed) toward the second substrate (the substrate on which the color conversion layer is formed).
- each color conversion layer is Further flattening reduces variation in emission color within or between pixels.
- “gradually or gradually decreases” means that, for example, the cross-sectional shape of the transparent wall becomes an inverted trapezoidal shape or a T-letter shape.
- the color purity of the light emission of the organic EL display device can be increased, and the color filter can cut the external light excitation light of the phosphor layer and increase the contrast.
- a combination of white light-emitting organic EL and a phosphor layer and Z or color filter can be used as a full-color organic EL display device.
- a large-screen, high-definition organic EL display device can be obtained without applying a load to the organic EL element at a low voltage.
- FIG. 1 is a diagram showing an organic EL display device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an organic EL display device that is useful in another embodiment of the present invention.
- FIG. 3 is a diagram showing an organic EL display device that is useful in another embodiment of the present invention.
- FIG. 4 is a diagram showing an organic EL display device that is useful in another embodiment of the present invention.
- FIG. 5 (a) is a schematic top view showing an end of a stripe pattern of a partition, and (b) is a schematic top view showing an example in which a vertical partition is formed.
- FIG. 6 (a) is a conceptual diagram showing an example in which the cross-sectional shape of the transparent partition wall is rectangular, and (b) is a conceptual diagram showing an example in which the cross-sectional shape of the transparent partition wall is an inverted trapezoid. is there.
- FIG. 7 is a diagram showing a process for forming a polysilicon TFT.
- FIG. 8 is a circuit diagram showing an electrical switch connection structure including a polysilicon TFT.
- FIG. 9 is a plan perspective view showing an electrical switch connection structure including a polysilicon TFT.
- FIG. 1 shows an organic EL display device according to an embodiment of the present invention.
- the organic EL display device 1 includes an organic EL substrate 100 in which an organic EL element 40 is formed on a first substrate 10, and a color conversion substrate 2 in which a color conversion layer 70 is formed on a second substrate 60. 00 and force The organic EL element 40 and the color conversion layer 70 are arranged so as to face each other.
- a TFT 20 in the organic EL substrate 100, a TFT 20, an interlayer insulating film 30, a lower electrode 42, an organic light emitting medium 44, an upper electrode 46, and a noria film 50 are formed on the first substrate 10.
- the lower electrode 42, the organic light emitting medium 44, and the upper electrode 46 constitute the organic EL element 40.
- a color conversion layer 70 and transparent partition walls 80 are formed on the second substrate 60.
- the partition wall 80 is located between the color conversion layers 70 and separates the color conversion layers 70. Further, the partition wall 80 also functions as a spacer between the organic EL substrate 100 and the color conversion substrate 200 in which the thickness T1 of the partition wall 80 is larger than the thickness T2 of the color conversion layer 70. Between the partition walls 80, there is a sealing medium 90 together with the color conversion layer 70.
- the organic EL substrate 100 and the color conversion substrate 200 are separated by the sealing adhesive layer 92 with the sealing medium 90 in between. Are bonded and sealed.
- the wall 80 when the wall 80 is formed on the second substrate by the photolithography method, since a transparent material is used for the wall 80, a thick film and high definition can be achieved.
- the color conversion layer 70 is also refined, and the aperture ratio of the organic EL display device can be increased to improve the light emission efficiency.
- the partition wall 80 can be made thicker, when a phosphor layer is used for the color conversion layer 70, the phosphor layer can also be made thicker, improving the fluorescence conversion efficiency of the phosphor and improving the organic EL display device. The luminous efficiency is improved.
- the OLED substrate 100 and the color conversion substrate 200 can be stably placed via this spacer, and the impact resistance of the large screen organic EL display device (mechanical And thermal) stability can be improved.
- the partition wall 80 serves as both a separation of the color conversion layer 70 and a spacer, the configuration of the organic EL display device can be simplified and a low-cost organic EL display device can be obtained.
- the light emitted from the organic EL element 40 is converted into a different wavelength or color by the color conversion layer 70 and extracted from the direction indicated by the arrow. If the color conversion layer 70 is the same, a monochrome (for example, white display) display device is obtained. If the color conversion layer 70 is different and three primary colors are obtained, a full color display device is obtained.
- a monochrome for example, white display
- the refractive index of the partition wall 80 is different from the refractive index of the color conversion layer 70.
- it is preferably different from all the refractive indexes.
- it is a top emission type that can increase the aperture ratio.
- FIG. 2 shows an organic EL display device according to another embodiment of the present invention.
- the light shielding layer 82 is formed on the partition wall 80 of the color conversion substrate 210. Is formed.
- a light shielding layer 82 is formed below the partition wall 80 of the color conversion substrate 220.
- a light shielding layer 82 is formed below and above the partition wall 80 of the color conversion substrate 230.
- the light shielding layer 82 By forming the light shielding layer 82 in this manner, the contrast of the organic EL display device can be improved, and the viewing angle dependency upon multicoloring and full colorization can be reduced.
- the light shielding layer is formed of a thin film that does not interfere with high definition and high aperture ratio, and does not have a function of separating the color conversion layer.
- FIG. 3 shows an organic EL display device according to another embodiment of the present invention.
- a reflective layer 84 having a function of reflecting visible light is formed on the side of the partition wall 80 of the color conversion substrate 240.
- the light emitted from the color conversion layer 70 is reflected by the reflection layer 84 and is effectively used for display of the organic EL display device.
- the side surface is roughened, or fine particles having a refractive index different from that of the partition wall are not included in the partition wall. Disperse and scatter and reflect visible light.
- FIG. 4 shows an organic EL display device according to another embodiment of the present invention.
- the color conversion layer 70 includes a blue pixel (blue conversion layer), a green pixel (green conversion layer), Consists of red pixels (red conversion layer)!
- the green phosphor layer 75 converts blue light into green light
- the red phosphor layer 77 converts blue light into red light.
- the color conversion substrate includes a translucent substrate, a transparent partition, a color conversion layer, and, if necessary, a light shielding layer and a reflection layer.
- Translucent substrate (equivalent to second substrate 60)
- the light-transmitting substrate used in the present invention is a substrate that supports the organic EL display device, and is preferably a smooth substrate having a light transmittance in the visible region of 400 nm to 700 nm of 50% or more.
- a glass plate, a polymer plate, etc. are mentioned.
- the glass plate include soda lime glass, norlium strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, norium borosilicate glass, and quartz.
- the polymer plate include polycarbonate, acrylic, polyethylene terephthalate, polyethersulfide, and polysulfone.
- the transparent partition used in the present invention is disposed between the color conversion layers of the color conversion substrate, contributes to separation of the color conversion layer, and also serves as a spacer for the organic EL substrate and the color conversion substrate.
- the “transparent” of the transparent barrier means that the light transmittance in the visible region with a wavelength of 400 nm to 700 nm exceeds 10%.
- the light transmittance at 400 to 450 nm exceeds 10%.
- the aspect ratio (height Z width) of the partition wall is preferably 1/2 (0.5) to 10Zl (10) 2/3 (0.67) to 5Zl (5 ) Is more preferable. If the aspect ratio is less than 1/2 (0.5), the advantages of high definition and high aperture ratio cannot be obtained. If the aspect ratio exceeds 10 Zl (10), the stability of the partition may deteriorate.
- Septum width ⁇ preferably 1 ⁇ m to 50 ⁇ m force, more preferably 5 ⁇ m to 30 ⁇ m force! / ⁇ . Width force 1 ⁇ If it is less than m, the stability of the partition walls as a spacer deteriorates, and if it exceeds 50 / zm, there is a possibility that the merit of high definition and high aperture ratio cannot be obtained.
- the preferred film thickness is automatically calculated from the preferred aspect ratio and width, and specifically, 0.5 m to 500 m.
- the surface shape of the transparent partition may be a lattice shape or a stripe shape.
- a lattice shape is preferable, but when seeking uniformity and stability of the color conversion layer, a stripe shape is preferred.
- the barrier rib perpendicular to the stripe is formed at the end of the stripe pattern of the barrier rib to prevent the color conversion layer from flowing out. Is preferably formed. An example is shown in Figure 5.
- FIG. 5 (a) is a schematic top view showing the end of the stripe pattern of the partition walls
- FIG. 5 (b) is a schematic top view showing an example in which vertical partition walls are formed. For simplification, only the second substrate and the transparent partition are shown, and other members are omitted.
- a vertical partition 81 is formed at the end of the stripe pattern of the partition wall 80 formed on the second substrate 60.
- the width of the transparent partition wall is gradually or gradually increased from the first substrate (the substrate on which the organic EL is formed) toward the second substrate (the substrate on which the color conversion layer is formed). Therefore, it is preferable to make it smaller. That is, the cross-sectional shape of the transparent partition wall is usually a rectangular shape, but is preferably an inverted trapezoidal shape or a T-shape.
- FIG. 6 (a) is a conceptual diagram showing an example in which the cross-sectional shape of the transparent partition wall is rectangular
- FIG. 6 (b) is a conceptual diagram showing an example in which the cross-sectional shape of the transparent partition wall is an inverted trapezoid.
- FIG. 6B an inverted trapezoidal transparent partition wall 80 ′ is formed on the second substrate 60.
- a color conversion layer 70 is formed between the transparent partitions 80 '.
- each color conversion layer 70 is flattened, and variations in emission color within or between pixels are reduced.
- a photosensitive resin to which a photolithography method can be applied is selected.
- acrylic acid-based, methacrylic acid-based, polycacinic acid bull-based, ring rubber-based Examples thereof include a photocurable resist material having a reactive bur group. These resist materials may contain fine particles such as various dyes, dyes, and pigments as long as they do not exceed the transparent range.
- the refractive index of the transparent partition is preferably different from the refractive index of the color conversion layer. Since the refractive index is different, light emitted from the color conversion layer can be prevented from being reflected at the partition interface and mixed into adjacent pixels, thereby improving the color reproducibility of the organic EL display device.
- the difference in refractive index between the color conversion layer and the transparent partition wall is preferably 0.1 or more.
- the side surface of the transparent partition wall has a function of reflecting visible light. Specific examples will be described later.
- the color conversion layer is a phosphor layer and a Z or color filter layer.
- a light emitting element such as an EL element
- blue light component wavelength range of 400 ⁇ ! To 500nm
- the color conversion layer of the present invention can partially transmit the blue light component of the light emitter and also convert light emitted by the light emitter power to white light by mixing yellow to red converted light.
- the phosphor layer includes at least a phosphor that converts the wavelength of light incident from the light emitter, and may be dispersed in a binder resin as necessary.
- an organic phosphor such as a fluorescent dye and an inorganic phosphor can be used.
- phosphors that convert violet light emission from near-ultraviolet light to blue light emission in the light emitters include 1,4 bis (2-methylstyryl) benzene (Bis-MBS), trans- And stilbene dyes such as 4,4′-diphenylstilbene (DPS) and coumarin dyes such as 7-hydroxy-4-methylcoumarin (coumarin 4).
- Bis-MBS 1,4 bis (2-methylstyryl) benzene
- DPS 4,4′-diphenylstilbene
- coumarin dyes such as 7-hydroxy-4-methylcoumarin (coumarin 4).
- phosphors for converting blue, blue-green or white light emission to green light emission for example, 2, 3, 5, 6-1H, 4H-tetrahydro-8 trifluoromethylquinolizino (9 , 9a, 1— gh) Coumarin (coumarin 153), 3— (2 ′ —benzothiazolyl) — 7—Jetyl aminocoumarin (coumarin 6), 3— (2 ′ — Benzimidazolyl)-7- ⁇ , ⁇ —Jetylami
- Examples include coumarin dyes such as nocoumarin (coumarin 7), other basic coumarin dyes such as basic yellow 51, and naphthanoleximide dyes such as sonorebento yellow 11 and sonorevent yellow 116, and perylene dyes.
- fluorescent dyes for converting blue to green light emission or white light emission to orange to red light emission for example, 4-disyanomethylene-2-methyl-6- ( ⁇ -dimethyl Aminostilyl) —Cyanine dyes such as 4) -pyran (DCM), 1-ethyl 2- (4— ( ⁇ -dimethylaminophenol) — 1, 3—butagel) —pyridium Pyridine dyes such as mu-park mouthrate (pyridine 1), rhodamine dyes such as uchidamine, rhodamine 6G and basic biored 11, and oxazine dyes.
- DCM -pyran
- 1-ethyl 2- (4— ( ⁇ -dimethylaminophenol) — 1, 3—butagel) pyridium Pyridine dyes such as mu-park mouthrate (pyridine 1), rhodamine dyes such as uchidamine, rhodamine 6G and basic biored 11, and oxazine dyes
- various dyes can be selected as phosphors if they are fluorescent.
- the phosphor is a pigment such as polymethacrylic acid ester, polyvinyl chloride, salt vinyl alcohol acetate copolymer, alkyd resin, aromatic sulfonamide resin, urea resin, melanin resin, benzoguanamine resin, etc. It may be a pigment kneaded in advance in a resin! / ⁇
- an inorganic phosphor an inorganic compound such as a metal compound absorbs visible light and emits longer fluorescence than the absorbed light. Can be used.
- the surface of the phosphor may be modified with an organic substance such as a long-chain alkyl group or phosphoric acid. By using an inorganic phosphor, the durability of the phosphor layer can be further improved. Specifically, the following can be used.
- Dopes doped with transition metal ions that absorb visible light such as + and Tb 3+ .
- Metal chalcogenides such as ZnS, CdS, CdSe, Eu 2+ , Eu 3+ , Ce 3+ , Tb 3+ etc. Doped with transition metal ions that absorb visible light.
- the surface may be modified with a metal oxide such as silica or an organic substance.
- the band gap can be controlled by changing the particle size nano-size, and as a result, the absorption-fluorescence wavelength can be changed.
- the surface may be modified with a metal oxide such as silica or an organic substance.
- the surface of CdSe fine particles may be coated with a high-bandgap semiconductor material shell such as ZnS! / !. This facilitates the effect of confining electrons generated in the central fine particles.
- the particle diameter of the semiconductor fine particles is changed, and Z or the composition is changed according to the emission color of the color conversion layer.
- the particle diameter is changed.
- semiconductor fine particles having substantially the same particle diameter should be used. Can do.
- the particle size distribution is as small as possible because the emission becomes sharper and the color purity and efficiency of the emission are improved.
- the particle size distribution is preferably 20% or less, more preferably 10% or less, more preferably 5% or less.
- the above inorganic phosphors may be used alone or in combination of two or more.
- a transparent material (with a light transmittance of 50% or more in visible light) is preferred for Noinder resin.
- transparent resin polymer
- polymer such as polyalkyl methacrylate, polyacrylate, alkylmethacrylate / methacrylic acid copolymer, polycarbonate, polybulal alcohol, polybutylpyrrolidone, hydroxychetylcellulose, carboxymethylcellulose, etc.
- a photosensitive resin to which a photolithography method can be applied is also selected in order to separate and arrange the phosphor layers in a plane.
- photocurable resist materials having reactive vinyl groups such as acrylic acid-based, methacrylic acid-based, polyvinyl cinnamate-based, and ring rubber-based.
- a printing ink (medium) using a transparent resin is selected.
- thermoplastic or thermosetting transparent resin such as chinole methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxyethyl cellulose, and carboxymethyl cellulose can be used.
- the phosphor layer is mainly composed of the phosphor, it is preferably formed by vacuum deposition on a substrate such as a glass plate through a mask capable of obtaining a desired color conversion layer pattern.
- the phosphor layer is composed of phosphor and binder resin, the phosphor, binder resin and appropriate solvent are mixed, dispersed or solubilized to form a liquid material, and the liquid material is placed on a substrate or the like.
- the film is formed by a method such as spin coating, roll coating, or casting, and then patterned into a desired color conversion layer pattern by a photolithographic method, or a desired pattern by a method such as inkjet or screen printing. It is preferable to form a color conversion layer by patterning.
- the thickness of the phosphor layer is not particularly limited as long as it sufficiently receives (absorbs) the light emitted from the light emitter and does not interfere with the function of color conversion. Therefore, it is preferable to set it to 0.4 111 to 499 111, more preferably 5 111 to 100 111.
- the material of the color filter is not particularly limited.
- the color filter may be composed of a dye, a pigment and a resin, or may be composed of only a dye or a pigment.
- color filters consisting of dyes, pigments and oils, dyes or pigments are dissolved or dissolved in binder oils. The thing of the disperse
- distributed solid state can be mentioned.
- dyes and pigments used in the color filter include perylene, isoindoline, cynin, azo, aged xazine, phthalocyanine, quinacridone, anthraquinone, and diketopyrrolopyrrole.
- the color conversion layer of the present invention is preferably a laminate of a fluorescent layer and a color filter, but may be a layer formed by mixing the above-described phosphor material and color filter material. Accordingly, the color conversion layer can be provided with the function of converting the light from the illuminant and the function of the color filter for improving the color purity, so that the configuration is simplified.
- the color filter forming method and film thickness are the same as those of the phosphor layer.
- a light shielding layer is formed on the lower and Z or upper portions of the transparent partition wall.
- the light shielding layer By forming the light shielding layer, it is possible to improve the contrast of the organic EL display device and reduce the viewing angle dependency in the case of organic multicolorization and full color.
- the surface shape of the light shielding layer may be a lattice shape or a stripe shape, but the lattice shape is more preferable in order to further improve the contrast of the organic EL display device.
- the transmittance of the light-shielding layer is preferably 10% or less in the light emitting member or in the region emitting light from the color conversion layer (particularly the phosphor layer), that is, in the visible region having a wavelength of 400 nm to 700 nm. 1% or less is even better!
- examples of the material for the light shielding layer include the following metals and black pigments.
- Metal types include Ag, Al, Au, Cu, Fe, Ge, In, K, Mg, Ba, Na, Ni, Pb, Pt, Si, Sn, W, Zn, Cr, Ti, Mo, Ta,
- One or more metals, such as stainless steel can be mentioned.
- the above metal oxides, nitrides, sulfides, nitrates, sulfates and the like may be used, and carbon may be contained if necessary.
- the above material may be formed by a method such as sputtering, vapor deposition, CVD, ion plating, electrodeposition, electroplating, chemical plating, or the like under a transparent partition wall (on a translucent substrate) or Can be formed on the upper part of the transparent barrier rib and patterned by a photolithography method or the like to form a light shielding layer pattern.
- black pigments include carbon black, titanium black, arlin black, and those blackened by mixing the color filter pigments. These black pigments or the above-mentioned metallic materials are dissolved or dispersed in the binder resin used in the color conversion layer to form a solid state, and patterned in the same manner as the color conversion layer, so that the lower and upper portions of the transparent partition walls The pattern of the light shielding layer is formed on the substrate.
- the side surface of the transparent partition wall has a function of reflecting visible light.
- Color conversion layer The emitted light is reflected by the side wall of the partition wall and is effectively used for the display of the organic EL display device.
- a layer that reflects visible light is disposed on the side surface of the partition wall, the side wall of the partition wall is roughened, or fine particles having a refractive index different from that of the partition wall are formed in the partition wall. It is dispersed to such an extent that it does not lose its properties, and the visible light is scattered and reflected.
- the reflectance of light in the visible region having a wavelength of 400 to 700 nm is preferably 10% or more, and more preferably 50% or more.
- the reflective layer is formed, for example, by forming a photoresist film on a portion other than the side surface of the transparent partition, and sputtering the metal material used in the light shielding layer and a high refractive index material such as titanium oxide, magnesium oxide, magnesium sulfate, It can be formed by stripping the photoresist (lift-off method) after oblique film formation by methods such as vapor deposition, CVD, and ion plating.
- the thickness of the reflective layer is preferably 0.01 to 1 / ⁇ ⁇ , more preferably uniformity and adhesion. In terms of surface area, it is 0.05 to 0.5 ⁇ m.
- an organic EL substrate is composed of a substrate and an organic EL element
- the organic EL element is composed of an organic light emitting medium and an upper electrode and a lower electrode that sandwich the organic light emitting medium.
- the following are the components of the organic EL substrate: (1) Support substrate, (2) Organic luminescent medium, (3) Upper electrode, (4) Lower electrode, (5) Interlayer insulating film, (6) Barrier film explain.
- Support substrate (corresponding to the first substrate 10)
- the support substrate in the organic EL display device is a member for supporting the organic EL element and the like, and it is preferable that it has excellent mechanical strength and dimensional stability.
- Examples of the material of the supporting substrate include a glass plate, a metal plate, a ceramic plate, or a plastic plate (for example, polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, Polyester resin, epoxy resin, phenol resin, silicon resin, fluorine resin, polyethersulfone resin) and the like.
- a glass plate for example, polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, Polyester resin, epoxy resin, phenol resin, silicon resin, fluorine resin, polyethersulfone resin
- a plastic plate for example, polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, Polyester resin, epoxy resin, phenol resin, silicon resin, fluorine resin, polyethersulfone resin
- the support substrate made of these materials can be further protected against moisture and hydrophobicity by forming an inorganic film or applying fluorine resin to prevent moisture from entering the organic EL display device.
- U which is preferred to have been given.
- the moisture content of the support substrate 1 is set to a value of 0.0001% by weight or less, and the water vapor or oxygen transmission coefficient is set to a value of 1 X 10 " 13 cc-cm / cm 2 -sec. CmHg or less. It is preferable to do.
- EL light emission is extracted from the side opposite to the support substrate, that is, from the upper electrode side, and therefore the support substrate does not necessarily have transparency.
- An organic light emitting medium is a medium including an organic light emitting layer capable of EL emission by recombination of electrons and holes.
- This organic light-emitting medium can be configured, for example, by laminating the following layers (a) to (g) on the anode.
- the configuration (d) is particularly preferred because it provides higher emission luminance and excellent durability.
- constituent elements of the organic light emitting medium will be described in the order of (i) an organic light emitting layer, (ii) a hole injection layer, (i ii) an electron injection layer, and (iv) an adhesion improving layer.
- Examples of the light-emitting material of the organic light-emitting layer in the organic light-emitting medium include p-quaterphenyl derivatives, p-quaterphenol derivatives, benzodiazole-based compounds, benzimidazole-based compounds, benzoxazole-based compounds, and metal chelate oxinoid compounds.
- Examples thereof include compounds, aromatic dimethylidin-based compounds, metal complexes having 8-quinolinol derivatives as ligands, and polyphenol-based compounds alone or in combination of two or more.
- organic light-emitting materials 4,4-bis (2,2-di-tert-butylphenol) biphenyl (abbreviated as DTBPBBi) or 4,4 as an aromatic dimethylidin-based compound.
- 4 Bis (2,2 diphenyl) biphenyl (abbreviated as DPVBi) and derivatives thereof are more preferred.
- an organic light emitting material having a distyrylarylene skeleton or the like is used as a host material, It is also preferable to use a host material in combination with a fluorescent dye having a strong blue power as a dopant up to red, for example, a coumarin-based material, or a material doped with a fluorescent dye similar to the host. More specifically, it is preferable to use the above-described DPVBi or the like as the host material, and N, N diphenylaminobenzene (abbreviated as DPAVB) or the like as the dopant.
- the hole injection layer in the organic luminescent medium 1 X 10 4 ⁇ 1 X 10 6 hole mobility measured when applying a voltage in the range of VZcm is 1 X 10 _6 cm 2 ZV 'more seconds
- constituent material of such a hole injection layer include a borphyrin compound, an aromatic tertiary amine compound, a stilamine compound, an aromatic dimethylidin compound, a condensed aromatic ring compound, for example, 4, 4 Bis [N— (1—Naphthyl) —N—Phenolamino] biphenyl (abbreviated as NPD), 4, 4 ′, 4 ”Tris [N— (3-Methylphenol) Organic compounds such as N-phenylamino] triphenylamine (abbreviated as MTDATA).
- an inorganic compound such as p-type—Si or p-type—SiC as the constituent material of the hole injection layer.
- the hole injection layer described above, between the anode layer or a hole injection layer described above, between the organic light emitting layer, conductivity of 1 X 10 _1G S / C m or more organic semiconductor It is also preferable to provide a layer. By providing such an organic semiconductor layer, the hole injection into the organic light emitting layer is further improved.
- the electron injection layer of the organic light-emitting medium there at 1 X 10 4 ⁇ 1 X 10 6 electron mobility measured when applying a voltage in the range of VZcm is 1 X 10 _6 cm 2 ZV 'seconds Therefore, it is preferable to use a compound having an ionization energy exceeding 5.5 eV.
- a metal complex of 8-hydroxyquinoline (A1 chelate: Alq), a derivative thereof, or an oxadiazole derivative can be given.
- the adhesion improving layer in the organic light emitting medium can be regarded as one form of such an electron injection layer. That is, it is a layer made of a material having particularly good adhesion to the cathode among the electron injecting layer, and it is also preferable to constitute a metal complex of 8-hydroxyquinoline or a derivative thereof.
- an organic semiconductor layer having a conductivity of 1 ⁇ 10 — 1 SZcm or more in contact with the above-described electron injection layer By providing such an organic semiconductor layer, the electron injection property into the organic light emitting layer is further improved.
- the thickness of the organic light emitting medium is not particularly limited, but for example, the thickness is preferably set to a value in the range of 5 ⁇ to 5 / ⁇ .
- the reason for this is that when the thickness of the organic light emitting medium is less than 5 nm, the light emission luminance and durability may decrease, while when the thickness of the organic light emitting medium exceeds 5 m, the value of the applied voltage increases. Because. Therefore, it is more preferable to set the thickness of the organic light-emitting medium to a value in the range of 10 nm to 3 ⁇ m, more preferably in the range of 20 nm to 1 ⁇ m.
- the upper electrode corresponds to an anode layer or a cathode layer depending on the configuration of the organic EL substrate.
- a material having a high work function for example, 4. OeV or more
- a material having a low work function for example, a material of less than 4. OeV, in order to facilitate electron injection.
- the upper electrode since it is an upper extraction type (top emission type), the upper electrode needs to have transparency in order to extract light through the upper electrode.
- cathode layer material examples include sodium, sodium monopotassium alloy, cesium, magnesium, lithium, magnesium silver alloy, aluminum, aluminum oxide, and aluminum.
- ITO indium tin oxide
- IZO indium zinc oxide
- Culn indium copper
- SnO tin oxide
- a transparent electrode such as zinc oxide (ZnO) is laminated on the cathode layer, or metals such as Pt, Au, Ni, Mo, W, Cr, Ta, and Al are used singly or in combination of two or more. It is also preferable to add to the cathode layer.
- the upper electrode can be selected from at least one constituent material selected from the group consisting of a light transmissive metal film, a non-condensed semiconductor, an organic conductor, a semiconducting carbon compound, and the like.
- the organic conductor is preferably a conductive conjugated polymer, an oxidizing agent-added polymer, a reducing agent-added polymer, an oxidizing agent-added low molecule, or a reducing agent-added low molecule.
- the oxidizing agent added to the organic conductor include Lewis acids such as salted iron, antimony chloride, and salted aluminum.
- examples of the reducing agent added to the organic conductor include alkali metals, alkaline earth metals, rare earth metals, alkaline compounds, alkaline earth compounds, rare earths, and the like.
- examples of the conductive conjugated polymer include polyaniline and derivatives thereof, polythiophene and derivatives thereof, and Lewis acid-added amine compounds.
- the non-condensed semiconductor is preferably, for example, an oxide, a nitride, or a chalcogenide compound.
- the carbon compound is preferably, for example, amorphous c, graphite, or diamond-like C.
- the inorganic semiconductor is preferably, for example, ZnS, ZnSe, ZnSSe, MgS, MgSSe, CdS, CdSe, CdTe, or CdSSe.
- the thickness of the upper electrode is preferably determined in consideration of sheet resistance and the like.
- the thickness of the upper electrode is preferably set to a value in the range of 50 nm to 5000 nm, more preferably a value of lOOnm or more. The reason for this is that by setting the thickness of the upper electrode within such a range, a uniform thickness distribution and a light transmittance of 60% or more can be obtained in EL emission.
- the surface resistance of the upper electrode can be set to a value of 15 ⁇ or less, more preferably a value of 10 ⁇ or less.
- the lower electrode corresponds to a cathode layer or an anode layer depending on the configuration of the organic EL display device.
- the material for the anode layer include indium stannate ( ⁇ ), indium zinc oxide ( ⁇ ), indium copper (Culn), tin oxide (SnO), zinc oxide (ZnO), anti-oxide.
- a combination of more than one species can be mentioned.
- the material of the lower electrode is not necessarily transparent. Rather, as one preferable form, it is preferable to form the light absorbing conductive material. With this configuration, the display contrast of the organic EL display device can be further improved.
- a preferable light-absorbing conductive material in that case, a semiconductive carbon material, a colored organic compound, or a combination of the reducing agent and the oxidizing agent described above, and a colored conductive oxide (for example, VO, MoO, WO
- preferable light reflective materials include the metal materials used in the light shielding layer and high refractive index materials such as titanium oxide, magnesium oxide, and magnesium sulfate.
- the thickness of the lower electrode is not particularly limited as in the case of the upper electrode.
- the interlayer insulating film in the organic EL display device is provided near or around the organic light emitting medium.
- the interlayer insulating film is used to increase the definition of the organic EL display device as a whole and to prevent a short circuit between the lower electrode and the upper electrode.
- the inter-layer insulating film is used as a base for protecting the TFT and forming the lower electrode on a flat surface.
- an interlayer insulating film is provided so as to fill a space between lower electrodes provided separately for each pixel. That is, the interlayer insulating film is provided along the boundary between the pixels.
- acrylic resin polycarbonate resin, polyimide resin, fluorinated polyimide resin, benzoguanamine resin, melamine resin, cyclic polyolefin, novolac resin, polyvinyl cinnamate, cyclization
- acrylic resin polycarbonate resin, polyimide resin, fluorinated polyimide resin, benzoguanamine resin, melamine resin, cyclic polyolefin, novolac resin, polyvinyl cinnamate, cyclization
- examples thereof include rubber, polyvinyl chloride resin, polystyrene resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, and polyamide resin.
- the interlayer insulating film is made of an inorganic oxide
- preferable inorganic oxides include oxide silicon (SiO or SiO 2), acid aluminum (Al 2 O or AIO), and titanium oxide (TiO 2).
- Zinc oxide Zinc oxide
- MgO magnesium oxide
- CaO calcium carbonate
- boric acid B
- X in the above inorganic compounds is a value within the range of l ⁇ x ⁇ 3.
- acrylic resin polyimide resin, fluorinated polyimide, cyclic polyolefin, epoxy resin, and inorganic oxide.
- these interlayer insulating films can be formed into a desired pattern by a force printing method in which a photosensitive group is introduced and processed into a desired pattern by a photolithography method.
- the thickness is preferably a value within the range of 10 nm to lmm, although it depends on the definition of display and the unevenness of other members combined with the organic EL. This is because such a configuration can sufficiently flatten irregularities such as TFTs or lower electrode patterns.
- the thickness of the interlayer insulating film within a range of, for example, 100 nm to 100 m, more preferably ⁇ ! The value should be in the range of ⁇ 10 m.
- organic EL is easily degraded by moisture and oxygen, these are blocked by a noria film.
- Transparent inorganic materials such as A10xNy, TiA10x, TiAlOxNy, SiTiOx, and SiTiOxNy are preferable.
- the film formation rate is slowed down at a low temperature (100 ° C or lower) so as not to deteriorate the organic EL.
- methods such as sputtering, vapor deposition, and CVD are preferable.
- these transparent inorganic materials are amorphous because they control deterioration of the organic EL device having a high blocking effect on moisture, oxygen, low molecular weight monomers, and the like.
- Such a barrier film preferably has a thickness of 10 nm to lmm.
- the thickness of the noria film is less than 10 nm, the amount of moisture and oxygen permeation may increase.
- the thickness of the noria film exceeds 1 mm, the film thickness increases as a whole. This is because there are cases where it cannot be typed.
- the thickness of the noria film is 10 ⁇ to 100 / ⁇ .
- the sealing medium is interposed between the organic EL substrate and the color conversion substrate, blocks water and monomers generated from the color conversion substrate, and refracts to efficiently incorporate light emitted from the organic EL element force into the color conversion layer. Adjust the rate.
- Examples of the material for the sealing medium include transparent resin and sealing liquid.
- Transparent resins that can be used as the material constituting the sealing medium include polyphenyl methacrylate, polyethylene terephthalate, poly-chlorostyrene, poly-naphthyl methacrylate, poly-bur naphthalene, poly-bur carbazole, polyester containing fluorene skeleton, etc. Is mentioned. Further, if the sealing adhesive described later is also transparent, it can be used.
- fluorinated examples thereof include hydrocarbons and oligomers of fluorinated olefins.
- aromatic ring-containing compounds, fluorene skeleton-containing compounds, bromine-containing compounds or ion-containing compounds, and high refractive index compounds such as metal compounds such as alkoxy titanium (dimethoxy titanium and diethoxy titanium), Adjust the refractive index by adding alkoxy titanium or the like.
- Adjustment of the refractive index of the sealing medium can be made smaller than the refractive index of the color conversion layer (especially phosphor layer) smaller than the refractive index of the barrier film or upper electrode, so that the interface reflection between each layer and film can be reduced. Therefore, it is preferable.
- the sealing adhesive layer is a layer that adheres the organic EL substrate and the color conversion substrate at the periphery of the display portion of the organic EL display device.
- an ultraviolet curable resin is also preferably composed of an ultraviolet curable resin, a visible light curable resin, a thermosetting resin, or an adhesive using them.
- an ultraviolet curable resin is also preferably composed of an ultraviolet curable resin, a visible light curable resin, a thermosetting resin, or an adhesive using them.
- these include Lack Truck LCR0278, 0242D (manufactured by Toa Gosei Co., Ltd.), TB3113 (epoxy system: manufactured by Sriichi Bond Co., Ltd.), Benefix VL (acrylic system: Vadel ( And other commercial products.
- FIGS. 7A to 7I are diagrams showing a process for forming a polysilicon TFT.
- FIG. 8 is a circuit diagram showing an electrical switch connection structure including a polysilicon TFT
- FIG. 9 is a plan perspective view showing an electrical switch connection structure including a polysilicon TFT.
- an a-Si layer 12 is formed on a 112 mm X 143 mm X l. 1 mm glass substrate 10 (OA2 glass, manufactured by Nippon Electric Glass Co., Ltd.) using a technique such as low pressure chemical vapor deposition (LP CVD). (Fig. 7 (a)).
- an excimer laser such as a KrF (248 nm) laser was irradiated on the ⁇ -Si layer 12 to perform annealing crystallization to form polysilicon (FIG. 7 (b)). This polysilicon was patterned into an island shape by photolithography (Fig. 7 (c)).
- the insulating gate material 14 was laminated by chemical vapor deposition (CVD) or the like to form the gate oxide insulating layer 14 (FIG. 7 (d)).
- the gate electrode 15 was formed by vapor deposition or sputtering (FIG. 7 (e)), the gate electrode 15 was patterned, and anodic oxidation was performed (FIG. 7 (f) to ( h)).
- a doped region was formed by ion doping (ion implantation), and thereby an active layer was formed, and a polysilicon TFT was formed as a source 16 and a drain 17 (FIG. 7 (i)).
- the gate electrode 15 (and the scanning electrode 21 in FIG. 8 and the bottom electrode of the capacitor 28) was Al, and the TFT source 16 and drain 17 were n + type.
- an interlayer insulating film (SiO 2) having a thickness of 500 nm is formed on the obtained active layer by the CRCVD method.
- the signal electrode line 22 and the common electrode line 23, the capacitor upper electrode (A1), the connection between the source electrode and the common electrode of the second transistor (Tr2) 27, the first transistor (Trl) 26 drains and signal electrodes were connected (Figs. 8 and 9).
- the connection between each TFT and each electrode was appropriately made by opening the interlayer insulating film SiO by wet etching with hydrofluoric acid.
- A1 and IZO indium zincate were sequentially deposited by sputtering at 20000 A and 1300 A, respectively.
- a positive resist (HPR204: manufactured by Fuji Film March) is spin-coated on this substrate, exposed to UV light through a photomask that forms a dot pattern of 100 m ⁇ 320 ⁇ m, and TMAH (tetramethyl)
- the resist pattern was obtained by developing with an image solution of (ammonium hydroxide) and betaning at 130 ° C.
- the exposed portion of IZO was etched with an IZO etchant composed of 5% oxalic acid, and then A1 was etched with a mixed acid aqueous solution of phosphoric acid, acetic acid, and nitric acid.
- the resist was treated with a stripping solution mainly composed of ethanolamine (106: manufactured by Tokyo Ohka Kogyo Co., Ltd.) to obtain an A1 ZIZO pattern (lower electrode: anode).
- Tr2 27 and lower electrode 42 were connected through opening X (FIG. 9).
- a black negative resist (V259BK: manufactured by Nippon Steel Chemical Co., Ltd.) was spin-coated, exposed to ultraviolet light, and developed with a developer of TMAH (tetramethylammonium hydroxide).
- TMAH tetramethylammonium hydroxide
- beta was performed at 220 ° C to cover the edge of A1 / IZO (film thickness 1 m, IZO opening 90 m X 310 m), and an organic interlayer insulating film was formed (not shown) .
- the TFT substrate was moved to an organic vapor deposition device (manufactured by Nippon Vacuum Technology), and the substrate was fixed to the substrate holder.
- an organic vapor deposition device manufactured by Nippon Vacuum Technology
- the substrate was fixed to the substrate holder.
- a hole injecting material 4, 4, 4, 4, 4, --Tris [N- (3-methylphenol) -N-phenylamine] MTDATA), 4, 4, -bis [N- (1-naphthyl) -N-phenolamino] biphenyl (NPD), 4, 4, 2-bis (2, 2-diphenyl) as a host of luminescent materials -Ruby) biphenyl (DPVBi), 1, 4-bis [4- (N, N-diphenylaminostyrylbenzene)] (DPAVB) as dopant, tris (8— The quinolinol) aluminum (Alq) and Li were charged, respectively, and the IZO (previous) target was attached to another sputtering
- the vacuum chamber was depressurized to 5 X 10 _7 torr, and then the layers were sequentially stacked by one vacuum drawing without breaking the vacuum from the hole injection layer to the cathode in the following order.
- MTDATA is deposited at a deposition rate of 0.1 to 0.3 nmZ second, the film thickness is 60 ⁇ m, and NPD is deposited at a deposition rate of 0.1 to 0.3 nmZ second, the film thickness is 20 nm.
- DPV Bi and DPAVB were deposited at a deposition rate of 0.1 to 0.3 nmZ seconds, deposition rate of 0.03 to 0.05 nm / second, and a film thickness of 50 nm.
- Alq was deposited at a deposition rate of 0.1.
- the substrate was moved to a sputtering tank, and IZO was formed as a cathode take-out electrode at a film formation rate of 0.1 to 0.3 nmZ seconds and a film thickness of 200 nm to produce an organic EL device.
- V259R manufactured by Nippon Steel Chemical Co., Ltd.
- V259R manufactured by Nippon Steel Chemical Co., Ltd.
- VPA204ZP5.4-2 (manufactured by Nippon Steel Chemical Co., Ltd.) is spin-coated as a transparent partition material, and exposed to UV light through a photomask that forms a lattice pattern, and 2% sodium carbonate. After developing with an aqueous solution, a beta pattern was formed at 200 ° C to form a pattern of transparent partition walls (thickness 25 m).
- this transparent partition has a light transmittance of more than 10% in the visible range of wavelengths from 400 nm to 700 nm (the transmittance is 450% at 450 nm).
- This ink was poured into the opening of the partition wall where no color filter was formed by screen printing, and a blue color filter pattern (film thickness 20 m) was formed by treatment at 150 ° C. for 30 minutes.
- an ink was prepared by dissolving Coumarin 6 in an amount of 0.02 molZkg (based on solid content) in an epoxy thermosetting ink (Seiko Advance 1300).
- This ink was poured into the opening of the partition wall on the green color filter by screen printing, and a green phosphor pattern (film thickness 20 m) was formed by treatment at 150 ° C. for 30 minutes.
- a green phosphor pattern film thickness 20 m
- rhodamine 6G: 0.15 g were used as epoxy thermosetting ink (Seiko Advance 1300, solid concentration 55 %)
- Ink dissolved in 90 g was prepared.
- This ink is poured into the opening of the partition on the red color filter by screen printing, and a red phosphor pattern (thickness 20 m) is formed at 150 ° C for 30 minutes to form a color conversion substrate. Obtained.
- a photo-curing adhesive (TB3113 manufactured by ThreeBond Co., Ltd.) is applied to the periphery of the display area on the manufactured organic EL substrate with a dispenser, and the color conversion substrate is converted into a color conversion layer ( (Phosphor layer and Z or color filter) receive light (so that the transparent partition overlaps the position of the second interlayer insulating film on the organic EL substrate)
- the organic EL substrate and the color conversion substrate were bonded together by irradiating the agent with ultraviolet rays to obtain an organic EL display device (aperture ratio 77%).
- liquid fluorocarbon fluoride (Daikin Industries demnum) was filled as a sealing medium (refractive index adjusting material).
- the white luminance became 126cdZm 2.
- the contrast ratio under the fluorescent lamp lOOOOlux illumination was 84: 1.
- Example 1 before forming the color filter under the transparent partition, 1. O / zm thin film light-shielding layer (V259BK manufactured by Nippon Steel Chemical Co., Ltd.) An organic EL display device was obtained under the same conditions except that it was formed in the same manner.
- V259BK manufactured by Nippon Steel Chemical Co., Ltd.
- Example 1 Except that 10% (based on solid content) of titer fine particles (MT500HD manufactured by Teika) was dispersed in VPA204ZP5.4-2 (manufactured by Nippon Steel Chemical Co., Ltd.) as a transparent partition material. An organic EL display device was obtained under the same conditions.
- the refractive index of the obtained transparent barrier rib was 2.0, which was higher by 0.4 or more than the refractive indexes of the color filter and the phosphor layer of 1.5 to 1.6.
- Example 1 after forming transparent barrier ribs, a positive resist (HPR204 manufactured by Fuji Film March) pattern (film thickness 1.5 / zm) was formed between the barrier ribs by a photolithography method, and then the reaction was repeated. Al is deposited on the entire surface of the substrate as the spray layer, and the positive resist pattern between the barrier ribs and the A1 film are peeled off with organic alkali (N303 by Nagase Sangyo) to form an A1 film (thickness 1500A) on the side wall of the barrier ribs.
- An organic EL display device was obtained under the same conditions as in Example 1 except that.
- the white luminance was 140 cdZm 2 , and the light emission luminance and color reproducibility (color purity) were improved as compared with Example 1. This occurred from the color conversion layer by arranging A1 on at least the side surface of the partition wall. This is presumably because the light is effectively used for display by the reflective layer, and the mixing of light between the color conversion layers is reduced.
- An organic EL display device was produced in the same manner as in Example 1, except that the cross-sectional shape of the transparent partition wall was changed to a reverse tapered shape (reverse trapezoidal shape). That is, after the transparent partition wall material (VPA204ZP5.4-2) was spin coated, the ultraviolet exposure was set to 1Z3 in Example 1. As a result, the shape of the lattice pattern becomes a reverse taper shape (reverse trapezoidal shape), the upper base (organic EL side) is 20 m wide, the lower base (color conversion substrate side) force S12 m width, film thickness 25 ⁇ m It became.
- Example 1 semiconductor nanocrystal: (CdSe) ZnS was used as the material of the red phosphor. That is, cadmium acetate dihydrate (0.5 g) and tetradecylphosphonic acid (TDP A) (1.6 g) were added to 5 ml of trioctylphosphine (TOP). Under a nitrogen atmosphere, the solution was heated to 230 ° C and stirred for 1 hour. After cooling to 60 ° C, TOP solution containing 0.2g of selenium 2 ml of the liquid was added to obtain a raw material solution.
- TOP trioctylphosphine
- Trioctylphosphine oxide (TOPO) (10 g) was placed in a three-necked flask and vacuum dried at 195 ° C. for 1 hour. The pressure was returned to atmospheric pressure with nitrogen gas, and the mixture was heated to 270 ° C. while maintaining a nitrogen atmosphere. The reaction (core growth reaction) was allowed to proceed while confirming the fluorescence spectrum of the reaction solution as needed. When the nanocrystal had a fluorescence peak at 615 ⁇ m, the reaction solution was cooled to 60 ° C to stop the reaction.
- TOPO Trioctylphosphine oxide
- the semiconductor nanocrystal (core) was precipitated by adding 20 ml of butanol, separated by centrifugation, and dried under reduced pressure.
- TOPO (5 g) was placed in a three-necked flask and vacuum-dried at 195 ° C for 1 hour. Return to atmospheric pressure with nitrogen gas, cool to 60 ° C in a nitrogen atmosphere, and suspend in TOP (0.5 ml) and 0.5 ml hexane.
- the above semiconductor nanocrystal (core) (0.05 g ) was added. After stirring at 100 ° C for 1 hour under reduced pressure, the temperature was raised to 160 ° C and the pressure was returned to atmospheric pressure with nitrogen gas (solution A).
- the obtained semiconductor nanocrystal was used as a binder resin in an epoxy-based thermosetting ink (Seiko Advance 1300). %) And a red fluorescent material using a semiconductor nanocrystal: (CdSe) ZnS was prepared.
- a red phosphor pattern (film thickness 20 / zm) was formed in the same manner as in Example 1 to obtain a color conversion substrate, and further an organic EL display device was obtained.
- the improvement in chromaticity of the green pixel area is due to the use of semiconductor nanocrystal fine particles, which increases the average refractive index of the red phosphor layer and increases the refractive index difference with the transparent barrier ribs. This is thought to be due to a decrease in mixing with the adjacent green conversion layer.
- Example 1 instead of a transparent barrier, a thick film (25 ⁇ m thick) light-shielding layer (V259BK manufactured by Nippon Steel Chemical Co., Ltd.) was used. It did not transmit and pattern formation was impossible.
- V259BK manufactured by Nippon Steel Chemical Co., Ltd.
- a light shielding layer could be obtained with a line width of 55 m.
- An organic EL display device was obtained under the same conditions as in Example 1 using this color conversion substrate.
- the characteristics of the organic EL display were evaluated in the same way as in Example 1.
- the emission luminance was 13 cdZm 2 with the color filter (CS100, manufactured by Minolta) and the CIE chromaticity coordinates.
- the white luminance was 68 cd / m 2 , and the emission luminance was significantly lower than that in Example 1. This is because the light-shielding layer cannot have a high-definition pattern, so that the aperture ratio of the color conversion substrate is remarkably reduced, and the light emission luminance (light emission efficiency) of the high-definition organic EL display device cannot be obtained sufficiently.
- Example 1 a transparent partition wall was polished to obtain a color conversion substrate in which the film thickness of the color conversion layer was almost the same (film thickness 20 ⁇ m).
- a photo-curing adhesive (TB3113 manufactured by ThreeBond Co., Ltd.) is applied to the entire surface of this color conversion substrate, and the color conversion substrate is the color conversion layer of the color conversion substrate (phosphor layer and Z or color filter).
- Transparent partition walls are organic After aligning and bonding, the organic EL substrate and the color conversion substrate are bonded to each other by irradiating the photocurable adhesive with ultraviolet light (to overlap the position of the second interlayer insulating film on the EL substrate). A display device was obtained.
- the device was subjected to a thermal cycle test (-40 ° C to 85 ° C, 100 cycles). Visual observation and lighting tests were performed before and after the test. Due to the peeling of the organic layer of the substrate, pixels that did not light up frequently occurred.
- the organic EL display device of the present invention is a consumer or industrial display, for example, a display for a portable display terminal, an in-vehicle display such as a car navigation system or an instrument panel, a personal computer for office automation (OA), a TV (TV receiver). ) Or display devices for FA (factory automation). In particular, it is used for thin, flat mono-color, multi-color or full-color displays.
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Abstract
Description
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EP05768330A EP1784054A4 (en) | 2004-08-26 | 2005-08-02 | ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE |
JP2006531499A JPWO2006022123A1 (ja) | 2004-08-26 | 2005-08-02 | 有機el表示装置 |
US11/571,702 US20080036367A1 (en) | 2004-08-26 | 2005-08-02 | Organic El Display Device |
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EP (1) | EP1784054A4 (ja) |
JP (1) | JPWO2006022123A1 (ja) |
KR (1) | KR20070049172A (ja) |
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Cited By (42)
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Also Published As
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TW200621085A (en) | 2006-06-16 |
EP1784054A1 (en) | 2007-05-09 |
KR20070049172A (ko) | 2007-05-10 |
US20080036367A1 (en) | 2008-02-14 |
EP1784054A4 (en) | 2008-09-03 |
CN1969595A (zh) | 2007-05-23 |
JPWO2006022123A1 (ja) | 2008-05-08 |
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